济阳坳陷沙河街组湖相页岩储层孔隙定性描述及全孔径定量评价

doi:10.11743/ogg20180602

Abstract

Abstract: The organic matter lamina,mineral composition,and pore geometry of the lamellar shale from the Shahejie Formation,Jiyang Depression,were qualitatively analyzed and the size and distribution of pores were quantitatively studied,through combined experimental methods,such as the large-area visual field splicing scanning electron microscope(SEM) technology,low temperature N₂/CO₂ adsorption experiment,and high pressure mercury intrusion experiment.Meanwhile,the characteristics of pore distribution before and after core cleaning were compared,and the possible spaces for shale oil enrichment were analyzed.The organic matter and calcite in the samples studied are distributed in both banded and dispersed forms,and the distribution of clay minerals and quartz is complex.Although the shale samples studied are in the stage of low maturity-oil generation,organic pores are still well developed in them,which may be ascribed to the efflux or escape of some hydrocarbons(especially the light oil and gas).In addition,large number of intergranular pores,intragranular pores and micro-cracks are also developed.Low-temperature N₂ adsorption experiment(used to describe pores with diameter being less than 100 nm)and high-pressure mercury intrusion experiment(used to describe pores with diameter ranging from 100 nm to a dozen μm)and large-area visual field splicing SEM scanning can effectively reflect the full size of lacustrine shale reservoir space.Interconnected reservoir space of shale is composed of pores of nano-scale(with pore diameter being less than 300 nm)and micro-fractures(with the width of 0.5 to a dozen of μm)in micrometer scale.While shale oil mainly accumulates in pores less than about 100 nm and micro-cracks larger than about 1 μm.The analytical methods and conclusions presented in this study can be of referential value to the related studies on shale during its oil generation stage.

Key words: large-area visual splicing, low-temperature N₂/CO₂ adsorption, high pressure mercury injection, reservoir space, lamellar lacustrine shale, Jiyang Depression

CLC Number:

TE122.2

Wang Min, Guan Ying, Li Chuanming, Liu Yang, Liu Wei, Xu Jianpeng, Li Zheng, Lu Shuangfang. Qualitative description and full-pore-size quantitative evaluation of pores in lacustrine shale reservoir of Shahejie Formation,Jiyang Depression[J]. Oil & Gas Geology, 2018, 39(6): 1107-1119.

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Qualitative description and full-pore-size quantitative evaluation of pores in lacustrine shale reservoir of Shahejie Formation,Jiyang Depression

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